[PATCH i-g-t v2 02/43] lib/igt_debugfs: Move is_mountpoint() to igt_aux

["José Expósito" <jose.exposito89@gmail.com>]

Rename is_mountpoint() to igt_is_mountpoint() and make it available in
igt_aux.h/c.

Refactor, no functional change.

Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Co-developed-by: Jim Shargo <jshargo@chromium.org>
Signed-off-by: Jim Shargo <jshargo@chromium.org>
Co-developed-by: Marius Vlad <marius.vlad@collabora.com>
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
---
 lib/igt_aux.c     | 31 +++++++++++++++++++++++++++++++
 lib/igt_aux.h     |  2 ++
 lib/igt_debugfs.c | 29 ++---------------------------
 3 files changed, 35 insertions(+), 27 deletions(-)

diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index f5bf48da6..2905824a5 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -1374,6 +1374,37 @@ static bool get_process_ids(struct igt_process *prcs)
 	return prcs->tid != 0;
 }
 
+/**
+ * igt_is_mountpoint() - Check if a path is a mounted filesystem
+ * @path: Root directory to test
+ *
+ * Returns: true if @path is the root of a mounted filesystem
+ */
+bool igt_is_mountpoint(const char *path)
+{
+	char buf[strlen(path) + 4];
+	struct stat st;
+	dev_t dev;
+
+	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	dev = st.st_dev;
+
+	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
+	if (stat(buf, &st))
+		return false;
+
+	if (!S_ISDIR(st.st_mode))
+		return false;
+
+	return dev != st.st_dev;
+}
+
 /**
  * igt_is_process_running:
  * @comm: Name of process in the form found in /proc/pid/comm (limited to 15
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index bfd83adca..e8a1788b2 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -314,6 +314,8 @@ double igt_stop_siglatency(struct igt_mean *result);
 
 bool igt_allow_unlimited_files(void);
 
+bool igt_is_mountpoint(const char *path);
+
 int igt_is_process_running(const char *comm);
 int igt_terminate_process(int sig, const char *comm);
 void igt_lsof(const char *dpath);
diff --git a/lib/igt_debugfs.c b/lib/igt_debugfs.c
index 8ac215a76..210a9cea0 100644
--- a/lib/igt_debugfs.c
+++ b/lib/igt_debugfs.c
@@ -67,37 +67,12 @@
  * General debugfs helpers
  */
 
-static bool is_mountpoint(const char *path)
-{
-	char buf[strlen(path) + 4];
-	struct stat st;
-	dev_t dev;
-
-	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/.", path), sizeof(buf));
-	if (stat(buf, &st))
-		return false;
-
-	if (!S_ISDIR(st.st_mode))
-		return false;
-
-	dev = st.st_dev;
-
-	igt_assert_lt(snprintf(buf, sizeof(buf), "%s/..", path), sizeof(buf));
-	if (stat(buf, &st))
-		return false;
-
-	if (!S_ISDIR(st.st_mode))
-		return false;
-
-	return dev != st.st_dev;
-}
-
 static const char *__igt_debugfs_mount(void)
 {
-	if (is_mountpoint("/sys/kernel/debug"))
+	if (igt_is_mountpoint("/sys/kernel/debug"))
 		return "/sys/kernel/debug";
 
-	if (is_mountpoint("/debug"))
+	if (igt_is_mountpoint("/debug"))
 		return "/debug";
 
 	if (mount("debug", "/sys/kernel/debug", "debugfs", 0, 0))
-- 
2.48.1